Minerals in rocks are considered what type of component of a chemical cycle?
A. reservoir
B. biotic community
C. abiotic community
D. exchange pool
E. none of these
Answer: A
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Referring to the figure above, the progression from Phase II HIV infection to Phase III is marked by
A) a high fever and swollen lymph nodes. B) a drop in the helper T cell count to less than 200/mm3. C) the complete absence of antibodies to HIV. D) decreasing HIV in the blood. E) helper T cell numbers recovering from an initial drop.
For plants, mycorrhizae are______
A) parasitic B) mutualistic C) an adaptation for photosynthesis D) agricultural pests
During embryonic development, the skeleton is initially made of ________, which is later replaced by bone
Fill in the blank(s) with correct word
In which example(s) below are models being used to make predictions and plan for the future?
a. A policeman clocking the speed of a motorist with a radar gun. b. Someone checks the weather forecast for the weekend. c. An evolutionary biologist estimates fitness by measuring gene frequencies over time. d. All of the above.